win: Add version to client registration request

util/win/exception_handler_server.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 299 matching lines @@
 
     case ClientToServerMessage::kRegister:
       // Handled below.
       break;
 
     default:
       LOG(ERROR) << "unhandled message type: " << message.type;
       return false;
   }
 
+  if (message.registration.version != RegistrationRequest::kMessageVersion) {
+    LOG(ERROR) << "unexpected version. got: " << message.registration.version
+               << " expecting: " << RegistrationRequest::kMessageVersion;
+    return false;
+  }
+
   decltype(GetNamedPipeClientProcessId)* get_named_pipe_client_process_id =
       GetNamedPipeClientProcessIdFunction();
   if (get_named_pipe_client_process_id) {
     // GetNamedPipeClientProcessId is only available on Vista+.
     DWORD real_pid = 0;
     if (get_named_pipe_client_process_id(service_context.pipe(), &real_pid) &&
         message.registration.client_process_id != real_pid) {
       LOG(ERROR) << "forged client pid, real pid: " << real_pid
                  << ", got: " << message.registration.client_process_id;
       return false;
@@ skipping 83 matching lines @@
 void __stdcall ExceptionHandlerServer::OnProcessEnd(void* ctx, BOOLEAN) {
   // This function is executed on the thread pool.
   internal::ClientData* client = reinterpret_cast<internal::ClientData*>(ctx);
   base::AutoLock lock(*client->lock());
 
   // Post back to the main thread to have it delete this client record.
   PostQueuedCompletionStatus(client->port(), 0, ULONG_PTR(client), nullptr);
 }
 
 }  // namespace crashpad